Analysis of long-distance RTK loose and tight combinations for GPS/BDS-3/Galileo/QZSS overlapping frequencies
In view of the overlapping frequencies of GPS/BDS-3/Galileo/QZSS,the performance of loose and tight combinations of dual-frequency overlapping frequencies in long baselines was analyzed for GPS/BDS-3/Galileo/QZSS in this paper.Firstly,the mathematical models for loose and tight combinations were established,and the ionospheric and tropospheric delay errors were corrected using error correction models.A random walk constraint model between epochs was applied to the residual of atmospheric delay to enhance inter-epoch constraints.Subsequently,the least square ambiguity decorrelation adjustment(LAMBDA)method was employed to fix ambiguities.Finally,the effectiveness of the methods was verified using real data from continuously operating reference stations(CORS)networks with the same receiver type.The results indicated that compared to loose combinations,tight combinations of GPS/BDS-3/Galileo/QZSS could effectively improve positioning performance and reduce the time to the first fix(TTFF),especially in challenging environments.The use of tight combination long-distance real-time kinematic(RTK)positioning algorithms could achieve centimeter-level positioning for moving stations with greater applicability.
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